The concept of displaying the accumulation of fatigue damage against time into flight is described. Two distinct modes of presentation are described: one called 'the ground mode' is suitable for use in ground analysis of load time histories and the other designated ' the snapshot mode' can be used in the real time environment. Examples drawn from operational aircraft loads data are used to demonstrate the usefulness of the display. The damage accumulation plot permits a ready identification of those flight conditions/flight activities which give rise to substantial fatigue damage. Thus it can be used to identify the structurally relevant flight data and so reduce the quantity of data that needs to be analysed in an operational loads measurement programme. It has many uses in the field of loads data analysis is of particular importance in advanced fatigue load monitoring systems, fleet management from a fatigue standpoint and in the specification of fatigue test loading sequences.

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